The Adams specimen illuminating mirror has two reflecting sides: flat and concave. Diameter = 6.5cm. This specimen is unusual in that the mirror is supported on a limb, not fastened directly to the pillar slider.
The condensing lens is mounted on an articulated arm. Lens diameter is 3.3cm, f=5cm. The position of the lens can be adjusted by loosening the jam screw and sliding the mount along the square support pillar.
Attached to one of the base legs is this articulated arm. It supported a simple lens (now missing). This type of ball-and-socket articulation is referred to as "Musschenbroek nuts" after Samuel and Johan van Musschenbroek (Leiden, c1660-1748).